Bubble machine



FIG. 1 is a front, top and right perspective view of a bubble machine showing my new design;

FIG. 2 is a top, front and left perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a detail view of area 9 in FIG. 4 ; and,

FIG. 10 is a detail view of area 10 in FIG. 4 .

The dash-dash broken lines in the figures illustrate portions of the bubble machine that form no part of the claimed design. The dash-dot broken line circles in FIG. 4 represent the boundary of the detail views shown in FIGS. 9 and 10 and form no part of the claimed design. 

CLAIM The ornamental design for a bubble machine, as shown and described. 